US commerce secretary Wilber Ross has said China needs to "guarantee fair and reciprocal treatment for US firms", as tension between the two countries threatens to escalate after President Trump blocked Canyon Bridge from purchasing Lattice Semiconductor.

Western Digital Corp said it will seek an injunction to block the sale of Toshiba's nand flash memory business, the latest twist in a saga that was thought to be over after a deal was agreed with a Bain-led consortium last week.

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